Investigation of Intracloud Lightning Detection in the Low and Very Low Frequency (VLF/LF)-Rage

在这项研究项目中，将通过在大慕尼黑地区升级的小型6传感器闪电探测网络，测量甚低频/低频范围(频率(1-200 kHz))闪电发生的新的定量和定性方面。实验分析将侧重于低幅度和内声(IC)放电。利用新开发的3D技术，IC源将被识别并与云对地(CG)回击区分开来。闪电数据将根据特征参数进行分析，如击击率、击打密度、ICCG强度比和击打幅度分别作为区域和时间的函数。结果用来研究与气象参数的相关性。研究的目的是关于雷暴单元的定义、生命周期和对恶劣天气条件的认识。与德国气象局(DWD)和大气物理研究所(DLR)的合作确保了气象数据源的可用性，主要是偏振多普勒干涉雷达(POLDIRAD)的反射率，并报告了恶劣天气条件和地面损害。特别强调的是低幅度放电和识别良好的IC源的作用，高度分辨率在Km范围内。该项目有助于了解来自扩展甚低频/低频网络的闪电数据作为气象应用的额外数据来源的资格。

In this research project new quantitative and qualitative aspects of lightning occurrence in the VLF/LF range (frequencies ( 1-200 kHz) will be measured by means of a small 6-sensor lightning detection network to be upgraded in the greater Munich area. Experiment analysis will focus an both low-amplitude and intracloud (IC) discharges. IC sources will be identified and distinguished from cloud-to-ground (CG) return strokes exploiting a newly developed 3D-technique. Lightning data will be analysed in terms of characteristic parameters such as stroke rate, stroke density, ICCG intensity ratio, and stroke amplitude as a function of area and time, respectively. Results serve to investigate correlations with meteorological parameters. Research aims concern definition of thunderstorm cells, life cycles and recognition of severe weather conditions. Co-operations with DWD (German Weather Service) and DLR (Institute for Atmospheric Physics) ensure availability of meteorological data sources, mainly reflectivity by polarimetric Doppler-interferometry radar (POLDIRAD), and reports an severe weather conditions and damage an ground. Particular emphasis is an the role of low-amplitude discharges and well identified IC sources, height-resolved in the km range. The project contributes to understand the qualification of lightning data from extended VLF/LF networks as additional data source for meteorological applications.